With his salary savings and much with self support, he went to Imphal, Manipur and got enrolled for pre-university college (PUC, equivalent to higher secondary) at Dhanamanjuri (D.M.)
[9] Recalling his struggle, he said: "During my college days I worked in a stone quarry, chiseling and carrying loads of boulders.
"[8] Zoramthanga officially joined the Mizo National Front freedom movement in 1965, while in his last year of college.
[10] When the MNF uprising started in 1966, he joined the guerrilla movement and went underground to Bangladesh (then East Pakistan) border.
In the 1993 election, MNF lost to the Indian National Congress party, but Zoramthanga won the Champhai constituency.
[14] When the assembly elections were held at the end of 1998, he led his party to victory and became the Chief Minister of Mizoram for the first time.
[16] His party was faced with a landslide defeat to the Zoram People's Movement in the 2023 Assembly elections, with Zoramthanga losing his own constituency.
The main allegation was supply of fencing materials from the Department of Agriculture to his private farm at Aii Puk during his tenure as Chief Minister (1998 to 2008).
A Public Interest Litigation was submitted to Gauhati High Court by an anti-corruption organization, People's Right to Information and Development Society of Mizoram (PRISM), in 2007,[20] and again in 2009.
[21] Upon lack of action, PRISM submitted the charges to the Anti-Corruption Bureau of Mizoram Police that included disproportionate wealth with respect to his income, supply of fencing materials to Aii Puk, and extortion of funds from government contractors.
[23] Zoramthanga declared that of his total capital, ₹44.9 million was his brother L. Nghakliana's and nephew Zoramchhana's which he managed on their behalf.
[25] Zoramthanga was acquitted of charges on misuse of power in the case of Aii Puk,[26] and as to the disproportionate wealth, the court "did not find sufficient evidence to prove" the allegations.
[23] In 2002, Zoramthanga's ministry created an agricultural development project largely to mitigate slash-and-burn system.
The scheme called Mizoram Intodelhna Project (MIP) was designed as financial gratis to farmers who were pursuing alternative agriculture systems.
[34] The police report, upon which Additional District Magistrate (Judicial) of Aizawl made a judgement, declared in December 2007 that it was a case of suicide.
In 2018, an information was published in a newsletter Congress Thlifim that Chanchinmawia's death was a case of murder and the then Chief Minister Zoramthanga masterminded the assassination.
[39] In March 2017, Mizo National Front and B. Zorampara, president of Peace Accord MNF Returnees Association, filed a case against Thansanga, an informer to the newsletter.
[40] On 17 May 2017, Zoramthanga filed a defamation case against Thansanga,[41] as well as James Thanghmingliana, the publisher, and David M. Thangliana, the editor.